Arnaud, Lebègue, Rabiller, and Alouani Reply:

A Reply to the Comment by Ludger Wirtz et al..

Figure 1

Calculated absorption spectrum versus photon energy averaged over the $E_{2g}$ mode at $45{\mathrm{cm}}^{-1}$ (black thick solid line) and over the $E_{1u}$ mode at $1590{\mathrm{cm}}^{-1}$ (cyan thin solid line) compared with the experimental data (empty circles) of Ref. 6. The height of the averaged spectrum over the $E_{2g}$ mode is taken as a reference. The vertical arrows indicate the positions of the dark and bright excitons for the ideal positions of atoms.